std::chrono::time_point

 

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Date and time utilities

time_point (C++11)

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C-style date and time

 

std::chrono::time_point

Member functions

time_point::time_point

time_point::time_since_epoch

time_point::operator+time_point::operator-

time_point::min

time_point::max

Non-member functions

common_type

operator+operator-

operator==operator!=operator<operator<=operator>operator>=

time_point_cast

floor (C++17)

ceil (C++17)

round (C++17)

 

Defined in header <chrono>
template<     class Clock,     class Duration = typename Clock::duration > class time_point;		(since C++11)

Class template std::chrono::time_point represents a point in time. It is implemented as if it stores a value of type Duration indicating the time interval from the start of the Clock's epoch.

Member types

Member type	Definition
clock	Clock, the clock on which this time point is measured
duration	Duration, a std::chrono::duration type used to measure the time since epoch
rep	Rep, an arithmetic type representing the number of ticks of the duration
period	Period, a std::ratio type representing the tick period of the duration

Member functions

(constructor)	constructs a new time point (public member function)
time_since_epoch	returns the time point as duration since the start of its clock (public member function)
operator+=operator-=	modifies the time point by the given duration (public member function)
min [static]	returns the time point corresponding to the smallest duration (public static member function)
max [static]	returns the time point corresponding to the largest duration (public static member function)

Non-member functions

std::common_type<std::chrono::time_point>	specializes the std::common_type trait (class template specialization)
operator+operator-	modifies the time point by the given duration (function template)
operator==operator!=operator<operator<=operator>operator>=	compares two time points (function template)
time_point_cast	converts a time point to another time point on the same clock, with a different duration (function template)
floor(std::chrono::time_point) (C++17)	converts a time_point to another, rounding down (function template)
ceil(std::chrono::time_point) (C++17)	converts a time_point to another, rounding up (function template)
round(std::chrono::time_point) (C++17)	converts a time_point to another, rounding to nearest, ties to even (function template)

Example

Run this code

#include <iostream>
#include <iomanip>
#include <ctime>
#include <chrono>
 
int main()
{
    std::chrono::system_clock::time_point now = std::chrono::system_clock::now();
    std::time_t now_c = std::chrono::system_clock::to_time_t(now - std::chrono::hours(24));
    std::cout << "24 hours ago, the time was "
              << std::put_time(std::localtime(&now_c), "%F %T") << '\n';
 
    std::chrono::steady_clock::time_point start = std::chrono::steady_clock::now();
    std::cout << "Hello World\n";
    std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
    std::cout << "Printing took "
              << std::chrono::duration_cast<std::chrono::microseconds>(end - start).count()
              << "us.\n";
}

Possible output:

24 hours ago, the time was 2011-10-25 12:00:08
Hello World
Printing took 84us.

See also

duration (C++11)

a time interval (class template)